Tracer appears to break if JAVA_HOME environment variable not set

[braymp]

Not sure what happened but I got this error again: https://github.com/CellProfiler/python-javabridge/issues/50. Setting JAVA_HOME "fixed" it.

[daviddao]

I encountered the same problem when building CPA. JAVA_HOME should be set, otherwise it is not possible to run

pip install javabridge

Via Mac best set with

export JAVA_HOME=$(/usr/libexec/java_home)

[AnneCarpenter]

Is further work needed here?

[braymp]

Probably should be documented somewhere, perhaps on the Tracer page (and the CPA dev wiki page if required for building CPA from source as well)